Vision Operator’s Manual (v12.0 MD) Keying • Ops 7–17
Foreground area. These are typically the pixels near the edge of the foreground, where it
blends into the background.
• Foreground — Foreground elements are those pixels that are not within the Background,
Shadow, Translucency, or Transition ranges. This is the area with colors that will not be
keyed out and will remain solid.
The remaining three adjustments that can be made to an Advanced UltraChrome chroma key
allow you to adjust spill suppression, edge softness and luminance.
• Spill Suppress — Spill Suppression elements are those pixels in the Foreground that
have a noticeable tint of the Background color. This typically occurs around the edge of
the foreground subject as glow from the background blue-screen or green-screen “spills”
onto them.
• Edge Softness — Edge Softness lets you apply varying degrees of softening to the
Foreground edges to help it blend in with the underlying background image that it is
being keyed over.
• Luminance — Luminance allows you to control the overall brightness of Shadow,
Translucency, and Transition areas as well as partial reflections to more closely match the
Foreground brightness.
Use the following procedure to adjust an advanced UltraChrome chroma key:
1. If the UltraChrome Menu is not displayed, press the CHROMA KEY button the
Keyers Module for the Keyer you are adjusting the chroma key for.
Operating Tip — If you only want to adjust the Foreground area of the chroma key,
proceed to Step (6.).
2. Adjust the Shadow area as follows:
• Press Shadow on the UltraChrome Menu 1-2. The Shadow adjustment allows
you to extract a shadow from the background. This is the actual shadow that the
foreground subject is casting onto the screen.
Shadow — UltraChrome Menu 1-2
•Use the Range knob on the UltraChrome Menu 1-2 to adjust the range of the
Shadow colors as follows:
› Increasing the Range value widens the Shadow area by including
lower-luminance background colors. The increased range comes as a result of
colors moving from the Translucent area to the Shadow area.
› Decreasing the Range value narrows the Shadow area by excluding
high-luminance colors. These excluded colors move back into the Translucent
area.
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